JPH01150115A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To provide the invisibility of the contours of transparent electrodes at the time of impression of no voltages and to prevent the defective orientation occurring in the discharge of static electricity at the time of rubbing by interposing transparent insulating films essentially consisting of SiO2 and ZrO2 between transparent electrodes and oriented films to cover the transparent electrodes. CONSTITUTION:The transparent electrodes 3 consisting of ITO films are patterned and formed respectively via undercoats 2 consisting of SiO2 on a pair of upper and lower glass substrates 1 and the transparent insulating films 6 essentially consisting of the SiO2 and ZrO2 and having 300-400Angstrom film thickness are formed to cover these transparent electrodes 3. The oriented films 4 are formed on the surfaces of the insulating films and a liquid crystal 5 is sealed between the oriented films 4 facing each other. Since the static electricity generated on the surface of the oriented films 4 at the time of rubbing is not released into the transparent electrodes 3 by the intervention of the insulating films 6, the partial destruction of the oriented films 4 by the heat generation of the electric discharge is obviated. Since the refractive index of the insulating films 6 is nearly the same as the refractive index of the ITO, the contours of the transparent electrodes 3 are substantially invisible from the outside when the voltage is not impressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display element (hereinafter referred to as LCD).
In particular, LC that undergoes alignment treatment by rubbing method during manufacturing.
Regarding D.

[Conventional technology]

A rubbing method is one method for aligning liquid crystal molecules in an LCD cell in a predetermined direction. This rubbing method is a technique in which the alignment film that covers the transparent electrode on the glass substrate is rubbed in a specific direction using silk cloth, etc., during LCD manufacturing, and as a result, the long axis direction of the liquid crystal molecules is aligned with the rubbing direction. oriented in parallel directions.

That is, when manufacturing the LCD with the conventional structure shown in FIG.
After forming a transparent electrode 3 made of a T O film and having a predetermined shape corresponding to a display panel, an alignment film 4 made of polyimide or the like is formed to cover this transparent electrode 3, and the surface of this alignment film 4 is oriented in a specific direction. Rub. Then, when a cell is formed by combining a pair of glass substrates 1 that have been subjected to rubbing alignment treatment, and liquid crystal 5 is sealed between alignment films 4 that face each other, the long sleeve direction of the liquid crystal molecules is aligned in a direction parallel to the rubbing direction. Becomes oriented. Note that the undercoat 2 is a film for preventing the Na component of the glass from eluting into the liquid crystal 5.

[Problem that the invention seeks to solve]

By the way, when such rubbing alignment treatment is performed, a large amount of static electricity is generated on the surface of the alignment film 4, but conventionally the alignment film 4 is formed directly on the surface of the transparent electrode 3 as shown in FIG. However, there was a problem in that static electricity during this rubbing was discharged into the transparent electrode 3. That is, when a large amount of static electricity is discharged into the transparent electrode 3, the heat generated may partially destroy the alignment film 4, leading to poor alignment.

Furthermore, since the glass substrate 1 and the transparent electrode 3 have different refractive indexes, the outline of the transparent tti 3 is visible from the outside when no voltage is applied to the LCD with the structure shown in FIG. This will damage the

Therefore, it is an object of the present invention to solve the problems of the prior art described above, to prevent poor alignment caused by electrostatic discharge, and to improve design by making transparent electrodes less visible when no voltage is applied. CD;fr- is to be provided.

[Means for solving problems]

In order to achieve the above object, the present invention provides an LCD in which a transparent electrode corresponding to a display pattern is provided on a glass substrate, and an alignment film for aligning liquid crystal molecules in a predetermined direction is provided on the transparent electrode. Between the transparent electrode and the alignment film, a film containing SiO□ and ZrO as main components and having a thickness of 30
A transparent insulating film of 0 to 400 layers was interposed, and this insulating film covered the transparent electrode.

[Effect]

According to the above means, since the transparent insulating film mainly composed of SiOz and ZrO□ exhibits a refractive index almost the same as that of ITO, the outline of the transparent electrode covered with this insulating film changes when no voltage is applied. It becomes difficult to see from the outside, and since the alignment film is provided through this insulating film, there is no possibility that static electricity generated on the surface of the alignment film during rubbing will be discharged into the transparent electrode.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part of an LCD according to an embodiment of the present invention, and parts corresponding to those in FIG. 2 are given the same reference numerals.

In FIG. 1, ITO is placed on a pair of upper and lower glass substrates 1 via undergoats 2 made of Sto.
A transparent electrode 3 made of a film is patterned and covered with a Sin.

A transparent insulating film 6 containing Zr0z as a main component is then formed. This insulating film 6 is made by dissolving organic silicon and organic zirconium in a solvent at a predetermined ratio, applying this solution to the surface of the transparent electrode 3, and baking it at 500°C for 30 minutes to a film thickness of 300 to 400 mm. The refractive index of the insulating film 6 thus formed is approximately 1.80.

In addition, in the case of this example, the specific component ratio of the above solution is as follows:
Organosilicon: 2.5% by weight, organic zirconium: 7.
5ffi 猾%? Phenylcellolph'' and octyl alcohol were used as the carrier in an amount of 45% by weight each.

Furthermore, alignment films 4 made of polyimide or the like are formed on the surfaces of insulating films 6 on each glass substrate 1, and liquid crystal 5 is sealed between the alignment films 4 facing each other. Since the surface of the alignment film 4 is previously rubbed in a specific direction using silk cloth or the like, the long axis direction of the liquid crystal molecules is aligned in a direction parallel to the rubbing direction.

In this way, when the insulating film 6 is interposed between the transparent electrode 3 and the alignment film 4, the static electricity generated on the surface of the alignment film 4 during rubbing is not discharged into the transparent electrode 3, but is absorbed into the air. Since the discharge continues, there is no risk that the alignment film 4 will be partially destroyed due to heat generated by the discharge, and alignment defects can be prevented. Furthermore, since the refractive index of this transparent insulating film 6 is almost the same as that of ITO,
The outline of the transparent electrode 3 covered with the insulating film 6 is hardly visible from the outside when no voltage is applied, improving the design. Note that the thickness of this insulating film 6 is 300 mm.
Since it is extremely thin with a thickness of ~400, the voltage drop applied to the liquid crystal 5 can be ignored.

〔Effect of the invention〕

As explained above, according to the present invention, a transparent insulating film containing Sin and ZrO as main components and having a refractive index almost the same as ITO is interposed between the transparent electrode and the alignment film. Therefore, there is no risk that static electricity generated on the surface of the alignment film during rubbing will be discharged into the transparent electrode, which prevents alignment defects caused by discharge, and also reduces the risk of the transparent electrode covered with this clear insulating film. When no voltage is applied to the contour, it becomes difficult to see from the outside, which brings about remarkable effects such as improved visibility.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an LCD according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional LCD. 1...Glass substrate, 3...
・Store Meiden Oval, 4...Alignment film, 5...
...Liquid crystal, 6...Insulating film. Figure 1 Figure 2

Claims (1)

[Claims] In a liquid crystal display element in which a transparent electrode corresponding to a display pattern is provided on a glass substrate, and an alignment film is provided on the transparent electrode for aligning liquid crystal molecules in a predetermined direction, there is a space between the transparent electrode and the alignment film. , SiO_2 and ZrO_
1. A liquid crystal display element, characterized in that a transparent insulating film containing A.